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Characterization of eluted metal components from coal during pretreatment and solvent extraction

机译：预处理和溶剂萃取过程中煤中洗脱的金属成分的表征

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摘要

Eluted metals from Enshu (a Chinese) and Stratford (an Australian) coal during pretreatments with methanol/water and dilute acetic acid solutions were characterized and quantitatively analyzed by solid-state ~(23)Na NMR, cation chromatography, X-ray fluorescence (XRF), and Inductively Coupled Plasma Atomic Emission Spectroscopy (1CP-AES) measurements. To achieve the requirements of solvent extracted coal (namely Hyper-Coal: HPC) for its direct utilization to gas turbine system, alkali and alkali-earth metals such as Na, K, and Ca should be removed from coals. A quantitative analytical method of alkali metals with ICP-AES in combination with flow injection system is established for the evaluation of remaining alkali metal contents, especially for the quantitative analysis of Na concentration in the original coal and its HPC. Microwave irradiation acidic digestion pretreatment under controlled high pressure and temperature is very essential to the prompt and quantitative analyses of all the metals in coals and their derived HPC. Combination of ICP-AES with XRF and/or cation chromatography is also effective for the respective analyses of the residue and the extract or filtrate. Solid-state ~(23)Na NMR spectra of the coals before and after solvent soaking pretreatment or acetic acid treatment revealed that ion-exchangeable Na species might be rather selectively eluted by these treatments. It is also suggested that the remaining Na species could not be removed by dilute acetic acid solutions.
机译：使用固态〜（23）Na NMR，阳离子色谱，X射线荧光（ XRF）和电感耦合等离子体原子发射光谱（1CP-AES）测量。为了达到将溶剂提取的煤（即超煤：HPC）直接用于燃气轮机系统的要求，应从煤中去除碱金属和碱土金属（如Na，K和Ca）。建立了ICP-AES与流动注射系统相结合的碱金属定量分析方法，用于评估残留碱金属含量，尤其是对原煤及其HPC中Na浓度的定量分析。在高压和高温下进行微波辐射酸性消解预处理对于快速定量分析煤中所有金属及其衍生的HPC至关重要。 ICP-AES与XRF和/或阳离子色谱法的结合对于残留物和提取物或滤液的相应分析也是有效的。煤在溶剂浸泡预处理或乙酸处理之前和之后的固态〜（23）Na NMR光谱表明，这些处理可能会选择性地洗脱可离子交换的Na物种。还建议用稀乙酸溶液不能除去其余的钠。

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